Title: Effects of Close-to-Nature Management on the Stand Growth in a Masson Pine(Pinus massoniana)Plantation in Southern China
Abstract: 【Objective】The effects of close-to-nature management on the growth of masson pine reserved tree,interplanted species and natural regeneration species in masson pine(Pinus massoniana Lamb.)plantation were researched and evaluated.【Methods】In January 2005,a thinning experiment was conducted in a 12-year-old masson pine plantation in Experiment Center of Tropical Forestry,Chinese Academy of Forestry,with five different levels of thinning intensity(i.e.0%,20%,30%,40%and 50%),of which each treatment had three replicates,by the method of randomized blocks.Then,three native broad-leaved tree species,i.e.Mytilaria laosensis,Castanopsis hystrixand Machilus pingii,were interplanted with a density of 120 trees/hm2 in the thinned masson pine plantation.In August 2013,we investigated the masson pine reserved tree,interplanted species and natural regeneration species in all plots(total 15 plots,each 30m×20m),with recording species name,dbh and height of individuals.【Results】Eight years late,a re-investigation of the plots showed that:There were extremely significant differences in the growth of average dbh,average height and stand volume of masson pine reserved trees in different thinning treatment stands(DBH:P 0.001;height:P =0.001;volume:P =0.008);The average dbh and height of masson pine reserved tree in the stands increased with increasing thinning intensity,whereas the stand volume decreased with increasing thinning intensity.The saplings of broad-leaved tree species benefited greatly from thinning management,but there were significant difference between tree species.The growth of M.laosensis was optimal in the 50%thinninge intensity stand,while C.hystrixand M.pingii were optimal in the 40% thinning intensity stand.The growth rate of M.laosensis was significat higher than that of both C.hystrixand M.pingii.The individual number of tree layer species were significant increased with thinning treatment,compared with unthinned stand(100±25trees/hm2).The individual number of tree layer of 20%,30%,40% and 50%thinning treatment was higher 8.72 times,11.22 times,11.06 times and 13.78 times than that in unthinned stand,respectively.The growth of height of natural regeneration tree was significantly increased while there were not significant differences in the growth of dbh.【Conclusion】According to the timber production and the growth of both interplanted tree and natural regeneration tree species,30% or 40% thinning treatment and interplanted native broad-leaved tree species may be an optimal selection for the close-to-nature management to masson pine plantation.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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